WO2017067041A1

WO2017067041A1 - Touch control display device

Info

Publication number: WO2017067041A1
Application number: PCT/CN2015/095581
Authority: WO
Inventors: 黄耀立; 谢剑星; 黄俊宏; 蔡育徵; 曹昌
Original assignee: 深圳市华星光电技术有限公司; 武汉华星光电技术有限公司
Priority date: 2015-10-20
Filing date: 2015-11-25
Publication date: 2017-04-27
Also published as: US20170262104A1; US10048785B2; CN105242808A; CN105242808B

Abstract

Disclosed is a touch control display device, comprising: a common electrode layer comprising a plurality of driving areas which are internally provided with a driving area electrode and are arranged in a rectangular array, a plurality of floating areas which are internally provided with a floating area electrode and are disposed between two adjacent rows of driving areas, wherein two adjacent floating areas are arranged at intervals and constitute a floating area pair, and an isolation area disposed between the driving areas and the floating areas. A floating connection line is disposed on a sensing layer, and one point of the floating connection line is electrically connected to the floating area electrode within a floating area in the floating area pair through a first via hole in an insulation layer, and the other point is electrically connected to the floating area electrode within another floating area in the floating area pair through a second via hole in the insulation layer. By means of embodiments of the present invention, not only the process difficulty in scooping a hole can be effectively reduced so as to improve production efficiency, but also the influence of environmental changes on touch control precision can be reduced by disposing the isolation area between the driving areas and the floating areas.

Description

Touch display device

The present invention claims priority to the priority of the application Serial No. 201510686201.6, filed on Oct. 20, 2015, the disclosure of which is incorporated herein by reference.

Technical field

The present invention relates to the field of display technologies, and in particular, to a touch display device.

Background technique

With the popularity of smart electronic products, capacitive touch screens are widely used in a variety of electronic products, such as: smart phones, tablets and so on. The existing capacitive touch screen is divided into an external capacitive screen represented by G+G (Glass+Glass), GF (Glass-Film), GFF (Glass-Film-Film), OGS (One glass solution), etc. On cell and In cell represent the embedded capacitive screen. In recent years, people are pursuing a more and more user-friendly experience, which has led to the situation of OGS, On cell, and In cell. Because of the unique advantages of In cell in the manufacturing process, it can be compared with OGS and On cell. It is lighter, lighter, and more responsive to customer needs. Therefore, the In cell touch display device is bound to become the mainstream of touch display devices.

As shown in FIG. 1 , FIG. 1 is a schematic plan view of a common electrode layer 100 of an In cell touch display device in the prior art. The common electrode layer 100 is divided into a plurality of driving regions 101 and a plurality of sensing regions 102. Each driving region 101 is provided with a corresponding driving region electrode, and each sensing region 102 is provided with a corresponding sensing region electrode. Specifically, the driving regions 101 are arranged in a matrix, and the sensing regions 102 are disposed between the adjacent two columns of driving regions 101. The drive region electrodes of the adjacent two drive regions 101 (referred to simply as drive region pairs) disposed in the same row are electrically connected by the drive leads 103. Due to the presence of the sensing region 102, it is necessary to route the driving leads 103 in a bridging manner.

FIG. 2 shows the manner in which the drive leads 103 shown in FIG. 1 are arranged. As shown in FIG. 2, a planarization layer 200 and a gate insulating layer 300 are sequentially disposed under the common electrode layer 100, wherein the planarization layer 200 is provided with data lines (because of the existence of the data lines, the planarization layer cannot be present) 200 is provided with a metal connection line 302 to avoid mutual interference between the metal connection line 302 and the data line) and a plurality of first via holes 201. The gate insulating layer 300 is provided with a plurality of second via holes 301 and a plurality of metal connection lines. 302. For each pair of driving regions, there are two first vias 201, two second vias 301 and a metal connecting line 302 corresponding thereto, wherein the driving region electrodes of one driving region 101 are sequentially located at their positive The lower first via 201 and the second via 301 are electrically connected to one end of the metal connecting line 302, and the driving region electrodes of the other driving region 101 sequentially pass through the first via 201 and the second via directly below thereof. 301 is electrically connected to the other end of the metal connection line 302. It should be noted here that the driving region electrodes and the metal connecting wires 302 filled in the first via 201 and the second via 301 together constitute a driving lead 103 for connecting the above-mentioned driving region pair. It can be seen that in order to lay the driving lead 103, it is necessary to dig through the two-layer structure in succession, and the planarizing layer 200 is generally thick (for example, 2 μm, which is 20 times the thickness of the gate insulating layer 300), further increasing the process difficulty of boring, so In the prior art, the In cell type touch display device has a complicated manufacturing process and a low yield.

Summary of the invention

Embodiments of the present invention provide a touch display device. Not only can the process difficulty of digging holes be effectively reduced, but also the production efficiency can be improved. Moreover, the influence of environmental changes on the touch precision can be reduced by providing an isolation region between the driving region and the floating region.

Embodiments of the present invention provide a touch display device including a sensing layer, an insulating layer, and a common electrode layer disposed in order from top to bottom, wherein:

The common electrode layer includes a plurality of driving regions arranged in a rectangular array and having driving region electrodes disposed therein, and a plurality of floating regions disposed between the adjacent two columns of the driving regions and having floating region electrodes therein Two adjacent floating zones are disposed at intervals and constitute a pair of floating zones, and an isolation zone disposed between the driving zone and the floating zone;

Suspension connecting lines are disposed on the sensing layer, and a point on the floating connecting line is electrically connected to a floating area electrode in a floating area of the pair of floating areas through a first via hole in the insulating layer Another point is electrically connected to the floating zone electrode in the other suspension zone of the pair of suspension zones through a second via in the insulating layer.

Wherein the common electrode layer further comprises a driving lead extending through the isolation region between two adjacent floating regions, wherein:

Drive zone electrodes in adjacent two of the drive zones located in the same row are electrically connected by the drive leads.

Wherein, when the image is displayed, the driving region electrode and the floating region electrode are electrically connected to a common voltage output terminal in the driving circuit; or

During touch scanning, the driving region electrodes are electrically connected to a common voltage output terminal in the driving circuit, and the floating region electrodes are left blank.

The sensing layer further includes a plurality of first sensing regions that are in one-to-one correspondence with the floating region, and the first sensing region is disposed in a positive region corresponding to the first sensing region. Above, the sensing region electrode is disposed in the first sensing region.

The sensing region electrode in the first sensing region is one of a metal mesh, a transparent indium tin oxide electrode, and a carbon nanotube electrode.

The sensing layer further includes a plurality of second sensing regions corresponding to the driving region, and the second sensing region is disposed at a positive driving region corresponding to the second sensing region. Above, the sensing region electrode is disposed in the second sensing region, wherein:

The sensing region electrode in the second sensing region is electrically connected through a third via in the insulating layer and a driving region electrode in a driving region corresponding to the second sensing region.

Wherein the sensing region electrode in the second sensing region passes through at least two of the third via holes in the insulating layer and a driving region electrode in a driving region corresponding to the second sensing region Electrical connection.

Wherein, the third via holes are arranged in a rectangular array.

The sensing region electrode in the second sensing region is one of a metal mesh, a transparent indium tin oxide electrode, and a carbon nanotube electrode.

In the embodiment of the present invention, a plurality of driving regions respectively provided with driving region electrodes arranged in a rectangular array are disposed on the common electrode layer, and a plurality of floating regions disposed between the adjacent two columns of the driving regions are disposed. a suspension region of the electrode, two adjacent floating regions are spaced apart and constitute a pair of floating regions, and an isolation region disposed between the driving region and the floating region; and a suspension connecting line is disposed on the sensing layer And one point of the suspension connection line is electrically connected to the floating area electrode in one of the suspension zone pairs through the first via hole in the insulating layer, and the other point passes through the second one in the insulation layer The via hole is electrically connected to the floating area electrode in the other suspension zone of the pair of suspension zones, thereby not only effectively reducing the process difficulty of digging holes, but also improving the production efficiency, and by providing an isolation zone between the driving zone and the suspension zone. Reduce the impact of environmental changes on touch accuracy.

DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without paying any creative work.

1 is a schematic plan view of a common electrode layer of an In cell type touch display device in the prior art;

2 is a layout manner of driving leads in the common electrode layer shown in FIG. 1;

3 is a schematic structural diagram of a touch display device according to an embodiment of the present invention;

4 is a schematic plan view of a common electrode layer according to an embodiment of the present invention;

FIG. 5 is a schematic plan view showing another common electrode layer according to an embodiment of the present invention; FIG.

FIG. 6 is a schematic plan view showing the sensing layer and the common electrode layer overlapped according to an embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

Please refer to FIG. 3. FIG. 3 is a schematic structural diagram of a touch display device according to an embodiment of the present invention. The touch display device can be a liquid crystal display, a digital photo frame display, a mobile terminal display, and the like. As shown in the figure, the touch display device in the embodiment of the invention includes:

As shown in FIG. 3 , the touch display device includes a common electrode layer 3 , an insulating layer 4 formed on the common electrode layer 3 , and a sensing layer 5 formed on the insulating layer 4 . In addition, the touch display device further includes a thin film transistor array 1 , a dielectric layer 2 formed on the thin film transistor array 1 , a dielectric layer 6 formed on the sensing layer 5 , and pixels formed on the dielectric layer 6 . Electrode layer 7.

Specifically, FIG. 4 shows a plan view of the common electrode layer 3 shown in FIG. As shown in FIG. 4, the common electrode layer 3 includes a plurality of driving regions 31, a plurality of floating regions 32, a plurality of driving leads 33, and an isolation region (IOS) 34 disposed between the driving region 31 and the floating region 32. As shown in FIG. 5, FIG. 5 is a schematic structural view between the driving region 31, the floating region 32, and the isolation region 34 in the common electrode region, wherein, in the display phase, the isolation region 34 and the common voltage output terminal in the driving circuit are electrically Connect, The isolation region 34 is grounded during the touch phase. For each pair of suspension zones, there is a drive lead 33 extending from the isolation zone between the pair of suspension zones (ie, the isolation zone between the two suspension zones 32 constituting the pair of suspension zones) to electrically connect to the same row Drive zone electrodes in adjacent two drive zones 31. The driving region electrodes in the adjacent two driving regions 31 in the same column are disconnected from each other, and the driving region electrodes are electrically connected by the driving leads 33 of the common electrode layer 3, and the floating region electrodes are connected by suspension. Line electrical connection. It should be noted that by providing the isolation region 34 between the driving region 31 and the floating region 32, the influence of environmental changes on the touch precision can be reduced.

In particular, the drive regions 31 are arranged in a rectangular array, and each drive region 31 is internally provided with drive zone electrodes, each of which is controlled by a common voltage output of a drive circuit (not shown in the drawings). A plurality of floating zones 32 are disposed between adjacent columns of drive zones 31. Referring to FIG. 2, similar to the driving region 31, the floating regions 32 are also arranged in a rectangular array, and floating region electrodes are disposed in each of the floating regions 32. Each of the floating zone electrodes is also controlled by the common voltage output of the drive circuit when displaying the image. In the embodiment of the invention, each adjacent two suspension zones 32 constitute a pair of suspension zones. As shown in FIG. 6, a schematic plan view in which the sensing layer 5 and the common electrode layer 3 are overlapped, the driving leads and the isolation region leads are respectively turned on from the edge of the isolation region 34 and the edge of the driving region 31 by using a hole. Since the optical display problem is caused only by crossing the trace above the floating region 32, the lead wires are required to be traversed above the driving region 31 and the floating region 32, and the lead wires are respectively turned on in the corresponding driving region 31 and the floating region 32 below. .

With continued reference to FIGS. 3 and 6, a plurality of first vias (not shown in the drawings) and a plurality of second vias (not shown in the drawings) are disposed in the insulating layer 4, wherein the first vias are The number of pairs is equal to the number of pairs in the floating zone, and the number of second vias is also equal to the number of pairs of floating zones. Each of the first vias uniquely corresponds to one pair of floating zones, and each of the second vias uniquely corresponds to a pair of floating zones. A suspension connecting line is directly above each of the first via holes, and a floating area of the pair of floating areas corresponding thereto is disposed directly below. A suspension connection line is traversed directly above each of the second via holes, and another suspension zone of the pair of suspension zones corresponding thereto is disposed directly below. Therefore, for each suspension connection line, a point on the suspension connection line is electrically connected to the suspension area electrode in a suspension area 32 of the suspension zone pair through the first via hole in the insulation layer 4, and the suspension connection line is further A point is electrically connected to the floating zone electrode in the other of the suspension zone by a second via in the insulating layer 4. It should be noted here that the suspension connection lines filled in the first via hole and the second via hole and the suspension connection line in the sensing layer 5 are combined. Suspended leads for connecting pairs of suspension zones. With the above structure, the electrical connection of the electrodes of the floating zone in the adjacent two floating zones 32 can be realized.

In the present embodiment, the driving region electrode and the sensing region electrode are respectively disposed in the common electrode layer 3 and the sensing layer 5, and only the edge layer 4 is isolated between the common electrode layer 3 and the sensing layer 5. The drive region electrodes may be electrically connected between the drive leads 33 in the common electrode layer 3, and the suspension region electrodes may be electrically connected between the suspension layers distributed in the sensing layer 5 and the insulating layer 4. In the process of forming each of the floating leads, only the layer of the insulating layer 4 needs to be perforated, and the thickness of the insulating layer 4 is much smaller than the thickness of the planarizing layer, thereby effectively reducing the process difficulty of the hole digging and simultaneously overcoming The defect of the yield reduction due to the multi-layer opening simplifies the product structure and improves the yield. Secondly, the manufacturing process of the touch display device can be completed by using a conventional TFT process without modifying the existing machine configuration. In addition, the In cell technology is used to integrate touch and display on the display panel, which improves production efficiency.

Optionally, the display and touch time-sharing control modes are used to achieve perfect cooperation between the display function and the touch function of the touch display device. Specifically, at the time of displaying an image, the driving region electrodes in each driving region 31 and the floating region electrodes in each floating region 32 are electrically connected to a common voltage output terminal in the driving circuit. During touch scanning, the driving region electrodes in each driving region 31 remain electrically connected to the common voltage output terminal in the driving circuit, and at this time, the floating region electrodes in the floating region 32 are left blank. In a preferred embodiment of the invention, the floating zone electrode can be vacant in the following manner: an electronic switch is connected in series between the floating zone electrode and the common voltage output of the drive circuit, the electronic switch being controlled by a controller. The controller determines that the touch display device is currently in the display image state and the touch scan state: when in the display image state, the controller controls the electronic switch to be closed to electrically connect the floating region electrode to the common voltage output terminal of the driving circuit; When in the touch scanning state, the controller controls the electronic switch to open to disconnect the floating region electrode from the common voltage output terminal of the driving circuit, and the floating region electrode is blanked.

Optionally, the sensing layer 5 further includes a plurality of first sensing regions corresponding to the floating region 32. The first sensing region is disposed directly above the floating region corresponding thereto, and is disposed in the first sensing region. There are sensing area electrodes. During touch scanning, the driving region electrodes in each driving region 31 remain electrically connected to the common voltage output terminal in the driving circuit, and at this time, the floating region electrodes in the floating region 32 are evacuated, and the floating region electrodes correspond to the same. The sensing region electrodes are electrically coupled, thereby increasing signal inductance and increasing signal to noise ratio. In particular, the sensing region electrode in the first sensing region is preferably a metal grid, transparent indium tin oxide One of the pole and carbon nanotube electrodes. When the sensing region electrode in the first sensing region is a metal mesh, the conductive resistance is lower, the sensing layer is thinner, and the strength and cost performance of the touch display device are improved.

Further, the sensing layer 5 further includes a second sensing area on the basis of the above embodiments. The number of the second sensing regions is equal to the number of the driving regions 31, and each of the second sensing regions uniquely corresponds to one driving region 31, and the second sensing region is disposed directly above the driving region 31 corresponding thereto . In addition, a sensing region electrode is disposed in the second sensing region. Correspondingly, a third via hole (not shown in the drawing) for connecting the sensing region electrode and the corresponding driving region electrode is further provided in the insulating layer 4. The sensing region electrode in the second sensing region is electrically connected to the driving region electrode in the driving region 31 corresponding thereto through the third via hole in the insulating layer 4. In particular, similar to the selection of the sensing region electrodes of the first sensing region, the sensing region electrodes in the second sensing region are preferably one of a metal mesh, a transparent indium tin oxide electrode, and a carbon nanotube electrode. When the sensing region electrode in the second sensing region is a metal mesh, the conductive resistance is lower, the sensing layer is thinner, and the strength and cost performance of the touch display device are improved.

In this embodiment, the setting of the sensing region electrodes in the second sensing region can improve the balance of the display pixels. The reason is as follows: In the prior art, the driving region electrode is generally a transparent indium tin oxide electrode, and its resistance is large. In the process of forming the driving region electrodes, the difference in resistance of the driving region electrodes in the respective driving regions 31 is large, thereby causing imbalance of display pixels. In this embodiment, due to the setting of the sensing region electrodes in the second sensing region, a resistor is connected in parallel at both ends of each driving region electrode, so that the total resistance of the driving region electrode and the sensing region electrode are connected in parallel. The decrease, in turn, causes the difference in the resistance (the total resistance after the parallel connection) of the driving region electrodes in the driving region 31 to be reduced, thereby contributing to an improvement in the balance of the display pixels. Moreover, when the sensing region electrodes in the second sensing region are preferably metal meshes, since the resistance of the metal mesh is small, the problem of a decrease in yield due to excessive reduction in total resistance can be avoided.

Further, the third via for connecting the sensing region electrode and the driving region electrode in the second sensing region may be one hole or a collection of a plurality of holes. In a preferred embodiment of the invention, the sensing region electrodes in the second sensing region are electrically connected through the at least two third vias in the insulating layer 4 and the driving region electrodes in the driving region 31 corresponding thereto.

In the embodiment of the present invention, a plurality of driving regions respectively provided with driving region electrodes arranged in a rectangular array are disposed on the common electrode layer, and are disposed in a plurality of suspensions between the adjacent two columns of the driving regions. a floating area of the area electrode, two adjacent floating areas are spaced apart and constitute a pair of floating areas, and an isolation area disposed between the driving area and the floating area; and a suspension connecting line is disposed in the sensing layer, And a point of each of the suspension connecting wires is electrically connected to a floating region electrode in a suspension region of the pair of floating regions through a first via hole in the insulating layer, and another point passes through a first portion in the insulating layer The two via holes are electrically connected to the floating region electrodes in the other suspension region of the pair of suspension regions, thereby not only effectively reducing the process difficulty of the hole digging, but also improving the production efficiency, and providing an isolation region between the driving region and the floating region. It can reduce the impact of environmental changes on touch accuracy.

It should be noted that, for the foregoing various method embodiments, for the sake of simple description, they are all expressed as a series of action combinations, but those skilled in the art should understand that the present invention is not limited by the described action sequence. Because certain steps may be performed in other sequences or concurrently in accordance with the present invention. In addition, those skilled in the art should also understand that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

In the above embodiments, the descriptions of the various embodiments are different, and the parts that are not described in detail in a certain embodiment can be referred to the related descriptions of other embodiments.

A person skilled in the art may understand that all or part of the various steps of the foregoing embodiments may be performed by a program to instruct related hardware. The program may be stored in a computer readable storage medium, and the storage medium may include: Flash disk, read-only memory (English: Read-Only Memory, referred to as: ROM), random accessor (English: Random Access Memory, referred to as: RAM), disk or optical disk.

The content downloading method and the related device and system provided by the embodiments of the present invention are described in detail above. The principles and implementation manners of the present invention are described in the specific examples. The description of the above embodiments is only used to help understand the present invention. The method of the invention and its core idea; at the same time, for the person of ordinary skill in the art, according to the idea of the present invention, there are some changes in the specific embodiment and the scope of application. In summary, the content of the specification should not be understood. To limit the invention.

Claims

A touch display device, wherein the device comprises a sensing layer, an insulating layer and a common electrode layer arranged in order from top to bottom, wherein:

The common electrode layer includes a plurality of driving regions arranged in a rectangular array and having driving region electrodes disposed therein, and a plurality of floating regions disposed between the adjacent two columns of the driving regions and having floating region electrodes therein Two adjacent floating zones are disposed at intervals and constitute a pair of floating zones, and an isolation zone disposed between the driving zone and the floating zone;

Suspension connecting lines are disposed on the sensing layer, and a point on the floating connecting line is electrically connected to a floating area electrode in a floating area of the pair of floating areas through a first via hole in the insulating layer Another point is electrically connected to the floating zone electrode in the other suspension zone of the pair of suspension zones through a second via in the insulating layer.
The touch display device of claim 1, wherein the common electrode layer further comprises a driving lead penetrating the isolation region between two adjacent floating regions, wherein:

Drive zone electrodes in adjacent two of the drive zones located in the same row are electrically connected by the drive leads.
The touch display device according to claim 1, wherein

The display region electrode and the floating region electrode are both electrically connected to a common voltage output terminal in the driving circuit when the image is displayed; or

During touch scanning, the driving region electrodes are electrically connected to a common voltage output terminal in the driving circuit, and the floating region electrodes are left blank.
The touch display device of claim 2, wherein the sensing layer further comprises a plurality of first sensing regions corresponding to the floating region, the first sensing region being disposed in the Directly above the floating area corresponding to the first sensing area, the sensing area electrode is disposed in the first sensing area.
The touch display device of claim 4, wherein the sensing region electrodes in the first sensing region are one of a metal mesh, a transparent indium tin oxide electrode, and a carbon nanotube electrode.
The touch display device of claim 1 , wherein the sensing layer further comprises a plurality of second sensing regions in one-to-one correspondence with the driving region, wherein the second sensing region is disposed in Directly above the corresponding driving region of the second sensing region, the sensing region electrode is disposed in the second sensing region, wherein:

The sensing region electrode in the second sensing region is electrically connected through a third via in the insulating layer and a driving region electrode in a driving region corresponding to the second sensing region.
The touch display device of claim 2, wherein the sensing layer further comprises a plurality of second sensing regions in one-to-one correspondence with the driving region, wherein the second sensing region is disposed in Directly above the corresponding driving region of the second sensing region, the sensing region electrode is disposed in the second sensing region, wherein:

The sensing region electrode in the second sensing region is electrically connected through a third via in the insulating layer and a driving region electrode in a driving region corresponding to the second sensing region.
The touch display device of claim 3, wherein the sensing layer further comprises a plurality of second sensing regions in one-to-one correspondence with the driving region, wherein the second sensing region is disposed in Directly above the corresponding driving region of the second sensing region, the sensing region electrode is disposed in the second sensing region, wherein:

The sensing region electrode in the second sensing region is electrically connected through a third via in the insulating layer and a driving region electrode in a driving region corresponding to the second sensing region.
The touch display device of claim 4, wherein the sensing layer further comprises a plurality of second sensing regions in one-to-one correspondence with the driving region, wherein the second sensing region is disposed in Directly above the corresponding driving region of the second sensing region, the sensing region electrode is disposed in the second sensing region, wherein:

The sensing region electrode in the second sensing region is electrically connected through a third via in the insulating layer and a driving region electrode in a driving region corresponding to the second sensing region.
The touch display device of claim 5, wherein the sensing layer further comprises a plurality of second sensing regions in one-to-one correspondence with the driving region, wherein the second sensing region is disposed in Second sensing Directly above the corresponding driving area of the area, the sensing area electrode is disposed in the second sensing area, wherein:

The sensing region electrode in the second sensing region is electrically connected through a third via in the insulating layer and a driving region electrode in a driving region corresponding to the second sensing region.
The touch display device of claim 6, wherein the sensing region electrodes in the second sensing region pass through at least two of the third vias and the second sense in the insulating layer The driving region electrodes in the driving region corresponding to the measuring area are electrically connected.
The touch display device of claim 7, wherein the third via holes are arranged in a rectangular array.
The touch display device of claim 6, wherein the sensing region electrodes in the second sensing region are one of a metal mesh, a transparent indium tin oxide electrode, and a carbon nanotube electrode.